AGKNX RC-30 Gearbox 1-3/8 in. splined Input Shaft, 1:1.47 Ratio with 12 Tapered Spline Output Shaft - Includes Replacement Stump Jumper / Flywheel 12 Splined Hub This gearbox features a 1:1.47 Speed Up gear ratio for use on 5' and larger diameter rotary cutters. Industry-standard 1-3/8 in. smooth diameter input shaft with 1/2" shear bolt hole and retaining ring groove and 1.57" diameter 12 tapered spline output shaft allow fitment to most light, standard, and medium-duty rotary cutters. Each gearbox features high-speed ball-bearing units and heat-treated gears and shafts to ensure long life. Four-bolt mounting matches industry standards. Gearboxes are shipped dry and require 16 ounces of 80-90W gear lube or equivalent. For more information or additional parts please contact us. LUBRICANT IS NOT INCLUDED Our gearbox also replace the following brands/part numbers: U920580000 Comer U9.135.800.10 Comer U9.205.800.00 Comer U913580010 Comer 9.119.000.20 Comer 9.135.000.20 Comer 911900020 Comer 913500020 Comer 45PRC30147-N Hico 81444 Bush Hog 826-384C Land Pride 101ST Comer Fits Brands & Models: Bush Hog Rotary Cutter : RZ160 Bush Hog Rotary Cutter: RZ60 Hico/Howse: 500C (2003 & Above Land Pride Rotary Cutter: RCR1672 (S/N 377687 & Above Land Pride Rotary Cutter: RCR1872 Kodiak Rotary Cutter: ST60 Kodiak Rotary Cutter: ST72